Retractable staircase



FIG. 1 is a perspective view of a retractable staircase showing my newdesign in a closed position;

FIG. 2 is a perspective view of the retractable staircase shown in anopen position;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a side elevational view thereof; and,

FIG. 5 is a top plan view thereof.

The portions of the retractable staircase shown in broken lines form nopart of the claimed design.

CLAIM The ornamental design for a retractable staircase, as shown anddescribed.